Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ea092e0c4851368f6a45ef502f0e93cb532cb63fbb507d1d2e8af92db45e3cc' 
  AND token = 'SzHxE9/WuPKhtx6yrYTW59nBkhQ5qNchn8jMqSRZPAc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}